Mitigation of Aero-Optic Distortions by Active Flow Control

Award Information
Agency:
Department of Defense
Branch:
Air Force
Amount:
$99,030.00
Award Year:
2002
Program:
STTR
Phase:
Phase I
Contract:
F49620-03-C-0003
Agency Tracking Number:
F023-0087
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Technology In Blacksburg, Inc.
2901 Prosperity Road, Blacksburg, VA, 24060
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
003220998
Principal Investigator
 Semih Olcmen
 Principal Research Engineer
 (540) 961-4401
 solcmen@techsburg.com
Business Contact
 Mrs.Tamara Murray
Title: Buiness Manager
Phone: (540) 961-4401
Email: tmurray@techsburg.com
Research Institution
 Virginia Tech
 Guy Indebetouw
 Mechanical Dpt and Physics Dpt
Blacsburg, VA, 24061
 (540) 231-8727
 Nonprofit college or university
Abstract
Technology in Blscksburg (Techsburg( and the Physics Department at Virginia Tech propose to investigate the potential of both active and passive devices to mitigate the aero-optical distortions generated in a supersonic flow over acylindrical-base/hemi-spherical-top directed energy system turret. A combined suction and blowing system will be used for active flow control, with vortex generators as passive flow control devices. Phase-front distortions of a large diameter laser beamwill be measured using a variable-shear-interferometry techinque.Techsburg has developed a novel method to produce suction and blowing from the same small fluidic actuator that reduces complexity over separate systems and produces more momentum for flow control than traditional blowing. The proposed technique begins byremoving the horse-shoe vortex/boundary layer forming on the wall near the nose of the turret with suction. Next the fluid removed from the nose region and some aditional air will be injected in predetermined directions into the wake of the turret toenhance mixing. The air suction will be generated by the blowing action with the use of the ejector pump technique. Vortex genertors with sized much smaller than the local boundary layer thickness will be placed on the hemi-spherical dome to cratevortices to delay the separation location over the aft section of the turret.

* information listed above is at the time of submission.

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